An analytical solution that’s right on time

The HALO 3Q H2O packs a punch in one all-included compact and affordable package. Using Tiger Optics’ renowned time-based technology—Continuous Wave Cavity Ring-Down Spectroscopy—you can verify moisture impurity levels down to 120 ppt in helium, with drift-free stability and virtually instant response. You’ll find our system exceptionally fast to install, easy to use and effortless to maintain, with built-in zero verification. The HALO 3Q H2O specializes in trace-level moisture detection in bulk gases and specialty gases, as well as gas mixtures.

Compact, affordable and powerful, the HALO 3Q H2O brings you:

  • Sub-parts per billion (ppb) moisture detection capability in an array of gases
  • Small footprint (two HALO 3Qs fit in a 19” rack)
  • Absolute measurement (freedom from calibration)
  • Low cost of ownership and great ease of use
  • Wide dynamic range—over four orders of magnitude
  • Clean technology


  • Gas Quality Control
  • Gaseous CRMs & Calibration Gas Mixtures
  • High-Purity Gases & Systems
  • Research & Development

Learn More


Laboratory & Scientific

Detection Capability

Detection and Matrix Range LDL (3σ) Precision (1σ) @ zero
H2O in N2 0 – 20 ppm 0.6 ppb 0.2 ppb
H2O in He 0 – 4 ppm 0.12 ppb 0.04 ppb
H2O in Ar 0 – 9 ppm 0.3 ppb 0.1 ppb
H2O in H2 0 – 16 ppm 0.4 ppb 0.12 ppb
H2O in O2 0 – 10 ppm 0.3 ppb 0.1 ppb
H2O in Clean Dry Air (CDA) 0 – 18 ppm 0.6 ppb 0.2 ppb
H2O in CO2 0 – 25 ppm 1.6 ppb 0.6 ppb


Operating range See Detection Capability table
Detection limit (LDL, 3σ/24h) See Detection Capability table
Precision (1σ, greater of) ± 0.75% or 1/3 of Sensitivity
Accuracy (greater of) ± 4% or 1/2 of LDL
Speed of response < 3 minutes to 95%
Environmental conditions 10°C to 40°C, 30% to 80% RH (non-condensing)
Storage temperature -10°C to 50°C
Gas Handling System and Conditions
Wetted materials 316L stainless steel (optional corrosion-resistant material), 10 Ra surface finish
Gas connections 1/4” male VCR inlet and outlet
Leak tested to 1 x 10-9 mbar l / sec
Inlet pressure 10 − 125 psig (1.7 − 9.6 bara)
Flow rate Up to 1.8 slpm
Sample gases Most inert, toxic, passive and corrosive matrices
Gas temperature Up to 60°C
Dimensions, H x W x D
Standard sensor 8.73″ x 8.57″ x 23.6″ (222 mm x 218 mm x 599 mm)
Sensor rack (fits up to two sensors) 8.73″ x 19.0″ x 23.6″ (222 mm x 483 mm x 599 mm)
Standard sensor 28 lbs (12.7 kg)
Alarm indicators 2 user programmable, 1 system fault, Form C relays
Power requirements 90 − 240 VAC, 50/60 Hz
Power consumption 40 Watts max.
Signal output Isolated 4−20 mA per sensor
User interfaces 5.7” LCD touchscreen, 10/100 Base-T Ethernet, RS-232
802.11g Wireless (optional), Modbus TCP (optional)
Certification CE Mark
U.S. Patent #7,277,177

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